<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>动态表格</title>

    <style>
        table{
            border: 1px solid;
            margin: auto;
            width: 500px;
        }

        td,th{
            text-align: center;
            border: 1px solid;
        }
        div{
            text-align: center;
            margin: 50px;
        }
    </style>

</head>
<body>

<div>
    <input type="text" id="id" placeholder="请输入编号">
    <input type="text" id="name"  placeholder="请输入姓名">
    <input type="text" id="gender"  placeholder="请输入性别">
    <input type="button" value="添加" id="btn_add">

</div>


    <table id="table">
        <caption>学生信息表</caption>
        <tr>
            <th>编号</th>
            <th>姓名</th>
            <th>性别</th>
            <th>操作</th>
        </tr>

        <tr>
            <td>1</td>
            <td>令狐冲</td>
            <td>男</td>
            <td><a href="javascript:void(0);" onclick="delTr(this);">删除</a></td>
        </tr>

        <tr>
            <td>2</td>
            <td>任我行</td>
            <td>男</td>
            <td><a href="javascript:void(0);"  onclick="delTr(this);">删除</a></td>
        </tr>

        <tr>
            <td>3</td>
            <td>岳不群</td>
            <td>?</td>
            <td><a href="javascript:void(0);"  onclick="delTr(this);">删除</a></td>
        </tr>


    </table>



<script>
    
    //1.获取btn
    var btn_add = document.getElementById("btn_add");
    //2.绑定单击事件
    btn_add.onclick = function(){
        //获取每一个输入框内容
        var id = document.getElementById("id").value;
        var name = document.getElementById("name").value;
        var gender = document.getElementById("gender").value;

        //获取表格
        var table = document.getElementById("table");
        
        //创建tr
        var tr = document.createElement("tr");
        //创建td
        var td_id = document.createElement("td");
        var text_id = document.createTextNode(id);
        td_id.appendChild(text_id);
        tr.appendChild(td_id);

        var td_name = document.createElement("td");
        var text_name = document.createTextNode(name);
        td_name.appendChild(text_name);
        tr.appendChild(td_name);

        var td_gender = document.createElement("td");
        var text_gender = document.createTextNode(gender);
        td_gender.appendChild(text_gender);
        tr.appendChild(td_gender);

        var td_option = document.createElement("td");

        var a = document.createElement("a");
        a.setAttribute("href","javascript:void(0);");
        a.setAttribute("onclick","delTr(this)");
        var text_a = document.createTextNode("删除");
        a.appendChild(text_a);
        td_option.appendChild(a);
        tr.appendChild(td_option);

        table.appendChild(tr);

    }

    function delTr(obj){
        var table = obj.parentNode.parentNode.parentNode;
        var tr = obj.parentNode.parentNode;
        table.removeChild(tr);
    }

</script>
</body>
</html>